Comparison of the Dielectric Response of Hybrid Polymer Composites Filled with One‐Dimensional and Two‐Dimensional Carbonaceous Materials in the Microwave Range

Abstract

AbstractThe response of E‐glass/epoxy composites filled with two‐dimensional (2D) graphene nanoplatelets (GnPs) and exfoliated graphene nanoplatelets (xGnPs), and one‐dimensional (1D) multiwalled carbon nanotubes (MWCNTs) to microwave is compared in the 8–12 GHz frequency range. The nanocomposites are prepared with 1.0, 1.4, 1.8, 2.2, and 2.6 wt.% of each type of nanofiller. The results of the complex permittivity shows that the E‐glass/epoxy composites filled with GnPs and xGnPs have superior dielectric properties as compared to that of MWCNTs‐filled composites. However, calculations and simulations of reflection loss (RL) have predicted poor microwave absorbing strength of GnPs and xGnPs composites as compared to that of MWCNTs. The calculations of AC conductivity and skin depth show that GnPs‐ and xGnPs‐filled hybrid composites have very large AC conductivity and short skin depth, which can suppress the ability of the composites to absorb electromagnetic waves. The decrease in wt.% of GnPs below 1.0 has improved the microwave absorption in hybrid composites.